HostLink is

communication protocol A communication protocol is a system of rules that allows two or more entities of a communications system to transmit information via any variation of a physical quantity. The protocol defines the rules, syntax, semantics (computer science), sem ...

for use with or between PLC's made by

Omron , styled as OMRON, is a Japanese electronics company based in Kyoto, Japan. Omron was established by in 1933 (as the ''Tateisi Electric Manufacturing Company'') and incorporated in 1948. The company originated in an area of Kyoto called ""( ja) ...

. It is an

ASCII ASCII ( ), an acronym for American Standard Code for Information Interchange, is a character encoding standard for representing a particular set of 95 (English language focused) printable character, printable and 33 control character, control c ...

-based protocol generally used for communication over

RS-232 In telecommunications, RS-232 or Recommended Standard 232 is a standard introduced in 1960 for serial communication transmission of data. It formally defines signals connecting between a ''DTE'' (''data terminal equipment'') such as a compu ...

RS-422 RS-422, also known as TIA/EIA-422, is a technical standard originated by the Electronic Industries Alliance, first issued in 1975, that specifies the electrical characteristics of a digital signaling circuit. It was meant to be the foundation ...

. The protocol enables communication between various pieces of equipment in an industrial environment for programming or controlling those pieces of equipment. The maximum allowed message size is 30

words A word is a basic element of language that carries meaning, can be used on its own, and is uninterruptible. Despite the fact that language speakers often have an intuitive grasp of what a word is, there is no consensus among linguists on its ...

per message. Larger messages can be sent by ' fragmentation' process, where the same slave returns a series of messages to build up the entire response. PLC host computers can transfer procedures, and monitor PLC data area, and control the PLC using the HostLink protocol.

External links

Hostlink Command Format

References

{{compu-network-stub Industrial computing Serial buses